Intracranial epidural abscess
Feb. 20, 2023
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This maneuver is for provocation of benign paroxysmal positional vertigo of the left posterior canal. A model of the left posterior semicircular canal is shown (UT utricle; CU cupula; OT otoconial debris). When the patient lies down, the particles move away from the cupula within the canal. The resulting inappropriate endolymph flow causes an unphysiologic activation of the posterior canal and leads to paroxysmal vertigo and torsional-vertical nystagmus. (Contributed by Dr. Thomas Lempert.)